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  Defines a choice parameter whose values are dynamically generated
  (via a groovy script) based on the value of another parameter.
  <b>For example:</b>
   Add a Choice parameter (param1) with values 'aaaa', and 'bbbb'. 
   Then add a Cascading Dynamic Choice Parameter (param2) and set the parentPropertyName to 'param1'. Use the following choices script:
   <br>
<pre>
def theval = ['1111', '2222'].collect {  "${param1}.${it}"}
theval
</pre>
   <br>
<b>(Note the use of 'param1'! That is how the value of the parent property will be made available to your groovy script.)</b>
     Then, when you change param1 to be 'aaaa', the possible options in param2 will change to 'aaaa.1111' and 'aaaa.2222'.
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